Surprised that few people are focussing on the safety aspect of all this.
1. US stats show that 4000 cabin crew injured annually either attempting to help pax shove bags into lockers or by same bags falling out on top of them. Injuries range from bumps and bruises to incapacity from broken bones and vertebrae.
2. IN turbulence, hard landings or emergencies passengers often injured by bins popping open as fuselage flexes and luggage raining down on them.
3. IN a crash tall people siiting in aisle seats are slightly more likely to get killed. Theory is they are subjected to rain of laptops, whiskey bottles and so forth striking their heads from behind.
4. Ten kilos is a tray of small beers, a bowling ball, etc. It's too much and the limit should be reduced to lightweight, soft items like coats and hats.
Where is the CAA, FAA in all this? Whenever I ask I'm told it's an airline decision and there is no safety limit.